Tire-alarm.



J. B. POLO.

TIRE ALARM. APPLICATION FILED JAN. 27, 1am,

v Patented Sept. 10, 1912.

S M 1mm J08 jahB. Po l0,

Q. [5. 7mm.

" citizen or; the United States, residing "2a- EesB T bici d nia s-a ik ii Clear Lake, in thecounty of Deuel and State of" South-Dakota, have invented certain new 7 and useful Improvements in Tire -Ala'rms,

referenceheing had to "theaccompanying' drawings. I y; present invention comprehends certain new and useful improvements. in ailtomobile appliances or accessories and relates" particularly "to :the class of attachments y I on" the line 4L 4'of jFig.' 2,1 and ,Fig. 5 ,isfa

known as tire alarms, designed to give notice to the occupants of anautomobile-or the like, When a tire becomes deflated below a predetermined' point. v v

The invention has for its primary object parativel'y few arid simple parts thatj-may he cheaply manufactured, readily assembled and easylto maintain in properly working order;

The invention also ha'sf'for its'object an improved construction of combined tire,

alarm and gage, whereby a spring pressed plunger of the, device ivillnot only servefas a part of the alarm proper, but Will at all times indicate, owing t'o its positiom the air.

pressure Within thetire-tuhe And theiin vention also aims to generally: improve this class" of devices and to render thm'Qmore useful and comm'ercially desirable a With these and'otherohjectsin yiew. as Will more fully appeal-as thedescription proceeds, the invention consists "essentiallyv in a tire alarm, includinga casing which may be readil y lsecure d to any-of theordinary or" conventional tlre valvel stems, :an

inwardly spring pressed tubular pll mger mounted in said casing and adapted to indicate' the pounds-pressure, in th inner tube to the valvef'stem of, which the device is secured, a spring seated valvecarried by said, plunger, andmeansjalsojcarriecl, by 'the plunger and erigageahle with. aprelatively stationary partpf' thefldevice whereby-at a; predetermined point Pih" the inward Imove; 4

ment of the plungerdue to a decrease in the air press l'r ithef spriiig seatd valvewill be" positively moved'away' from its seat, so as to allow the air toissue from sound pro-r ducting ports that are formed in the, outer.

end of the plunger .l cap. And 1 the inven tion also consists in certain constructions,

fspe ei fieatiohi liettersigdtent eateries, i.

that shall hereinafter fully describe and cla m'tgy reference isto be had to'the following de scription and accompanying drawing, 1. in, which':' i U I Figure l is a transverse'i sectional xView myinvention in- ,aipplied position Fig. 2is- Corresponding see like parts in rfrrdfj reference-characters, 3} Referring to the drawing, the numeral 1 designates [a wheel felly, 2 a rirn tsecured thereto; and 3 a tpneumatic: tire 1 held on ,the

v rim and havingl'its inner tube with thensual A valve stem 4, which, in carrying out my 0 invention gisde'void of therordinary spring s'elve ,.0ffa'rryfdesird or approvedeonstrucu comprises 2} preferably cylindrical casing,,, ;5. ivhi'ch isv interiorly threaded at one; endzy Whj'ereby'it' may bedetachahly engaged ;-lwith 9- and helds on the'ordinary threaded nipplefi cylindrical casing-5 is interiorly threadedi For a'full unddrstaiiding of the v through et -Wheel felly rim and tire shovving 55 to in-thefollowinfg description. and desig-h .;nated in the accompanying drawing by like an improved construction of device of this character which will he. composed of com-"v 'seated "valve; gThese parts may be, 0f them-t i of ithevalve stem 4. The outer. ehdyof the for engagementby the threaded bushing 7; 1.

provided with a stop flange 8,.asl shown, and movable iii; the bushingf7 and the cas .;-t ing 5 is a tubular plunger 9, the openingns which extends longitudinally entirely through said plunger being desig-nated :10. #Atffits; inner end, the plunger- L9 is formed with a valve Seat 11 communicating With the; inner end of the openinglO, and an- 100 ordinary. pneu' matic tire check val ve 12 ;1s ,adaptedtoclose on said seat, so as to-pre;.

vent. air from passing out; through. the opens if v,

ing; The valvei 12, is formed with a guiding. v -ste n ,l 3 theouter: end of which extends nto 1 "the: opening 10 a1 1d is provided vwith the o ry: sp e a i hea 1.4 e m tw which. the coiled. valve closing spr ng 15' bears, I whereby to normally hold the valve; 1112 on its seat;11;.g The-inner end lever is fulcrumed intermediate of its ends as at 19 on a post 20 or the like which forms a part of the plunger 9, the lever having a laterally extended arm 21 which is designed for engagement by a stop lug 22 that proj'ects inwardly from and that is formed preferably as an integral part of a bushing 23 which is threaded in the inner end of the casing 5. v

"A spring 24 is coiled around the plunger 9, the inner end of said spring lbearing against an annular shoulder 25 which is formed on the plunger near the inner end of the latter, and the outer end of the spring reacting against the bushing 7, as clearly illustrated in Fig. 2.

From as much of the description as has preceded, in connection with the accompanying drawing, the operation of my improved tire alarm will be apparent.

.In the practical use of the device, so long as the pressure within the inner tube is at normal, or above, the plunger 9 will be held in a relatively extended position within the casing 5, and consequently, the trip lever 18 will be out of contact with the outwardly projecting lug 22 of the bushing 23. As the air pressure decreases, the plunger 9 will be moved inwardly by its spring 24, in an evident manner, and when the air pressure is reduced to a predetermined point, say forty pounds to the square inch, the trip lever 18 will have its rearwardly or laterally extending arm 21 engaged by the lug 22, whereupon a further inward movement of the plunger will, as is obvious, cause the lever 18 to rock on its fulcrum 19 and positively move the valve 12 fromvits seat 11 against the tension of the spring 15. Thus the air will be permitted to pass out through the opening 10 and issuefrom the ports 26 that are formed in a preferably detachable cap 27 secured to the outer end of the. plunger. As the air issues through the ports 26 it will produce an audible signal andapprise the occupant of the car that a tire has become deflated beyond the safety point.

It is. to be particularly noted, as best illustrated by Figs. 4 and 5, that the plunger 9 and its bushing 7 are not entirely circular in cross section, each being formed with a flat side, designated 28. By the engagement of the adjacent flat surfaces 28, the plunger 9 will be prevented from turning when the nipple of a tire pump is screwed thereon or -cular portion 29, so that the removed therefrom. In order to prevent the escape of the air when. the'tire uiiip nipple is being unscrewed from the threaded outer end 'ofthe plunger 9, the unger is formed intermediate of its ends with a cirbe pulled out and the shoulder formed by the circular portion engaged with the surface 28 of the bushing 7 so as to temporarily plunger may hold the plunger in a partially extended position, until the pump nip le has been entirely detached, whereupon the plunger 9 is turned so as to permit its spring 24 to freely act. The plunger 9 displays roper graduations, as bestillustrated in ig. 1, whereby the pressure within the tube may be determined at a glance, the plunger thereby fulfilling a double function.

30 designates the ordinary retaining nut and 31'designates the ordinary dust excluding sleeve which, in the present instance, is open at its outer end, to accommodate the. casing 5.

If desired, the outer end of the cap 27 may be recessed as shown, so as to serve for a valve removing wrench.

By varying the position of the plu or bushing 23 in the casing 5, it is manifest that itslug 22 may be caused to engage and trip the lever 18 in different relative positions ofthe plunger, whereby the point at which the alarm would be sounding may be varied, at will. While the accompanying drawing illustrates what I believe to be the preferred embodiment of my invention, it is to be understood that the invention is not limited thereto but that various changes may be made in the construction, arrangement and proportion of the parts without departing from'the scope of the invention as defined in the appended claims.

Having thus fully described my invention including a casing,- a spring retracted plunger mounted therein and formed with a longitudinal opening and a valve seat leading thereinto, a spring pressed valve on said seat, a lever opcratii'ely connected to said valve to unseat the same, and means for automatically tripping said lever at a predetermined point in the inward movement of the plunger.

2. An alarm of the character described,

including a casing, a plunger mounted in the casing and spring pressed inwardly therein, the plun er being formed with a longitudinal opening and a valve seat opening thereinto, aspring pressed valve on said seat, and opening inwardly therefrom, the

plunger being formed with a sound producing port communicating with its open-, ing, the valve being provided with an inwardly projecting stem, a lever carried by the' plunger and engaging .saidtstem and relatively stationary means carried by the casing for tripping said lever at a. predeter, mined point in the inwarcl'movement of the plunger. 3. An alarm of the characte; described,

- including a casing, a plunger movable therein and spring pressed inwardly, the plunger being formed with a longitudinal opening a lever carried. by the plunger, and rela tively stationary means carried by the casing for automat cally tripping said lever at a predetermined point in the inward movement'of the plunger.

4. An alarm of the character described, including a casing, a plunger movable therein and spring pressed inwardly, the plunger being formed with an .opening leading to. the atmosphere and with a valvesea-t comniunicating with said opening, a spring pressed valve mounted on said seat and opening inwardly, means for automatically opening said valve at a predetermined point in the inward movement of the plunger, and means for holding said plunger stationary in an extended position, against the tension of its spring and independently of the air pressure.

5. An alarm of the character described, including a casing, a plunger movable therein and spring pressed inwardly, the plunger being formed with an opening adapted to produce an audible signal and with a valve seat communicating with and facing inwardly from said opening, a spring pressed valve mounted on said seat, a trip lever carried by the plunger and adapted to open the valve, and a bushing carried by the casing and formed with a lug adapted to engage said lever to trip the same at a predetermined point in the inward movement of the plunger.

6. An alarm of the character described,

including a casing, a bushingsecured to the outer end of the casing and formed with a partially circular and apartially straight wall, a plunger movable in said casing and formed with an exterior wall adapted to fit the wall of the bushing, the plunger being movable longitudinally in the casing and spring pressed inwardly therein, the plunger being formed intermediate of its ends with a shoulder adapted to engage the outer end v movement of the of the straight portion of the bushing wall whereby to hold the plunger, against the tension of its spring and independently of air pressure in a partially extended posit-ion, at will, the plunger being formed with an opening and a valve seat communicating with said opening and facing inwardly, a valve adapted to close on said opening, and means for automatically opening said valve at a. predetermined point on the inward lunger.

, 7. An alarm of the character described, including a casing a plunger movable longitudinally in the casing and spring pressed inwardly therein, the plunger being formed with a sound producing opening and an inwardly facing valve seat communicating with said opening, a spring pressed valve adapted to close on said seat, the plunger being formed at its inner end with an inwardly projecting post, a lever fulcrumed intermediate of its ends on said post, the valve being formed with an inwardly projecting stem engaged by one arm of said .lever and a bushing screwing in the inner end of the casing and formed with an outwardly projecting lug adapted to engage the other arm of the lever to trip the latter at a predetermined point in the inward movement of the plunger.

8. An alarm of the character described, including a casing, a plunger movable therein and spring pressed inwardly, the plunger being formed with an opening adapted to produce an audible signal and with a valve seat communicating with and facing 1nwardly from said opening, a'spring pressed valve mounted on said seat, a trip lever carried by the plunger and adapted to open the valve, and a bushing adj ustably mounted in the casing and formed with a lug adapted to engage said lever to trip the same at a predetermined point in the inward movement of the plunger.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

G120. S. LIVINGSTON, FREDERICK S. S'rrr'r. 

